Method for laser butt welding of one or several billets of hardened steel with application of filler wire

FIELD: metallurgy.

SUBSTANCE: billet (1) or billets (1, 2) are at least 1.8 mm thick and/or at the joint (3) there is a jump (d) at least 0.4 mm thick. Laser welding is carried out with an insertion of the filler wire (10) into the melt (8) created by laser beam (6). To ensure the welded seam can reliably solidify into the martensite structure during the solidification under the press, the filler wire (10) is used which contains at least one alloying element from the group consisting of manganese, chromium, molybdenum, silicon and/or nickel, which promotes formation of austenite in the melt (8) created with the laser beam (6). At least one alloying element is presented in the filler wire (10) with at least 0.1 wt % higher than in the press-hardened billet or billets (1, 2) steel.

EFFECT: improved efficiency.

11 cl, 2 dwg

 



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: invention can be used to weld parts out of high nickel alloys of high temperature units with operation temperature up to 950°C. Welding wire contains in wt %: carbon 0.01-0.05, silicon 0.05-0.2, manganese 1.3-2.0, chrome 14.0-16.0, molybdenum 6.0-7.0, tungsten 2.5-3.5, iron 17.0-20.0, nitrogen 0.01-0.04, yttrium 0.01-0.1, zirconium 0.05-0.15, calcium 0.001-0.1, sulphur below 0.010, phosphorus below 0.015, nickel - rest.

EFFECT: welding wire is characterised by improved process strength and high short-term mechanical properties and long-term strength.

2 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: invention can be used during structures arc welding in shielded gas using flux cored electrode wire. Weld metal contains specified chemical components and 20% or more particles of Ti-containing oxide. The equivalent diameter of the specified particles diameter is 0.15-1.0 mcm. Their quantity is at least 5000 per mm2. Quantity of vanadium presenting in form of the compound in the weld metal as calculated to total weight of the weld metal is 0.002% or more. Average equivalent diameter of circle of V-containing carbide presenting in the weld metal is 15 nm or below.

EFFECT: weld metal has high strength and high resistance to cold cracking due to decreasing of the hydrogen diffusion.

2 cl, 5 dwg, 6 tbl

FIELD: metallurgy.

SUBSTANCE: brazing alloy contains the following in wt %: copper 51.8-58.2, tin 16.8-23.2, titanium 16.8-23.2, molybdenum 3.2-9.5.

EFFECT: silver absence in brazing alloy, and low temperature of brazing significantly reduce risk of microcracks and softening of diamond crystals during brazing.

1 ex, 1 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention can be used in contact welding of galvanised steel. The composite contains the ingredients in the following ratio, wt %: titanium 0.2-1.1, carbon 0.05-0.20, copper - the rest.

EFFECT: electrodes made of the above material and applicable for contact welding possess high adhesion resistance to a zinc coating and good heat resistance, as well as contact resistance stability that causes a high operational life.

4 tbl

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to brazing filler for high temperature brazing of stainless steel. Brazing filler powder on Fe-Cr base for high temperature brazing of the base metal out of stainless steel contains in wt %: Cr from 11 to 35, Ni up to 30, Cu from 5 to 20, Si from 2 to 10, P from 4 to 10, Mn up to 10, Fe - rest, at least 20. If Si content is below or equal to 6 wt %, P content is over 8 wt %, and at P content below or equal to 8 wt %, Si content is over 6 wt %.

EFFECT: brazing filler makes brazed joint with high strength and good corrosion resistance.

15 cl, 2 tbl, 5 ex

FIELD: metallurgy.

SUBSTANCE: composition contains metallic powder on the basis of iron with addition of chrome and boron and additionally aluminium and aluminium oxide at the following component ratio, wt %: aluminium 1-15; aluminium oxide 5-35; metallic powder is the rest.

EFFECT: alloy with high hardness is obtained at laser cladding.

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, and namely to filler material for attachment of plates by welding and can be used in automobile industry for welding of thin-wall plates of automobile bodies. Filler material for attachment thin automobile plates with thickness of less than 1.5 mm from high-alloyed stainless steels by welding or soldering, with that, it contains the following components, wt %: Zn 15 to 40, Mn 5 to 30, Ni 0.01 to 10, impurities in the amount of not more than 1, and Cu is the rest. Filler material is used as material of filler wire for soldering or welding with an emission source in the form of a heat supply device.

EFFECT: providing possibility of attachment of thin plates at low temperatures with reduction of deforming forces during the attachment process.

9 cl

Welding filler // 2543577

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to welding filler, which can be used for welding of rotors of gas turbines. The filler contains, wt %: C 0.05-0.15, Cr 8-11, Ni 2.8-6, Mo 0.5-1.9, Mn 0.5-1.5, Si 0.15-0.5, V 0.2-0.4, B 0-0.04, Re 1-3, Ta 0.001-0.07, N 0.01-0.06, Pd 0-60 ppm, P - no more than 0.25, S - no more than 0.02, iron and background impurities - the rest.

EFFECT: filler is characterised by good wettability, increased creep resistance, high viscosity.

13 cl, 4 dwg, 1 tbl

FIELD: metallurgy.

SUBSTANCE: melting material for steel material acting as base metal contains the following, wt %: C from 0.2 to 1.5, Si from 0.5 to 2, Mn from 0.5 to 2, Cr from 20 to 40, Mo from 2 to 6, Ni from 0.5 to 6, V from 1 to 5 and W from 0.5 to 5, the rest is Fe and inevitable impurities.

EFFECT: weld metal is characterised by high resistance to corrosion and abrasion wear, as well as high impact hardness at room temperature.

13 cl, 11 dwg, 4 tbl, 7 ex

FIELD: metallurgy.

SUBSTANCE: metal of a weld contains the following, wt %: C 0.02 to 0.12; Si 0.10 to 2.0; Mn 0.90 to 2.5; Ni 0.20 to 3.5; Mo 0.05 to 1.5; Ti 0.040 to 0.150; N not more than 0 and less than or equal to 0.015; and O 0.030 to 0.10, Fe and inevitable impurities are the rest. Particles of residual austenite are present at number density of 2500 per square millimetre or more and at total volume ratio of 4.0% or more in terms of total volume of all structural components of metal of a weld.

EFFECT: metal of a weld has high resistance to hydrogen embrittlement and is resistant to cracking at low temperatures.

6 cl, 5 dwg, 9 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: fixation of plates to be welded, their compression along the welding line and welding is performed by moving a laser head along a weld joint. Besides, compression along the welding line is performed with compression force of 0.01-1 kg/mm2. Laser welding of steel plates with thickness of 5-10 mm is performed at movement speed of laser head of 1000-2000 mm/min at laser emission power of at least 8 kW and helium blowing of the weld joint on the laser head side, and argon blowing thereof on the opposite side of the weld joint. After that, welded plates are annealed at the temperature of 1040-1110°C during 50-80 minutes.

EFFECT: creation of an economic laser butt welding method of plates from steel with low content of boron, which provides identity of chemical composition of weld metal and metal of the weld joint and improvement of stability of weld joint metal to intercrystalline corrosion.

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, particularly to the method of making bands of steel sheets whereat, at least, two strips of different-grade and/or different-depth steel sheet are welded together by their lengthwise sides. At least, two strips of different-grade and/or different-depth steel sheet are welded together by their lengthwise sides in one pass. Initial strips have no coating. Then, coat is applied on strips welded together. Note here that band is subjected to short-term heating over its entire width to normalise its structure.

EFFECT: higher strength.

12 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: proposed method comprises welding in atmosphere of inert gas with simultaneous effects of laser and arc in one welding bath. In welding, arc torch is arranged ahead of laser beam along its path. Welding wire is directed to the points whereat laser beam crosses welded parts surface. Laser beam is inclined through 30-40 degrees in opposite sides with respective to normal to welded parts surface.

EFFECT: higher quality of welded seam.

FIELD: metallurgy.

SUBSTANCE: sheet is made from steel of the following composition, wt %: 0.10 ≤ C ≤ 0.5, 0.5 ≤ Mn ≤ 3, 0.1 ≤ Si ≤ 1, 0.01 ≤ Cr ≤ 1, Ti ≤ 0.2, Al ≤ 0.1, S ≤ 0.05, P ≤ 0.1, 0.0005 ≤ B ≤ 0.010, the rest is iron and impurities inevitable at smelting, and consisting of steel substrate and pre-coating. Pre-coating is formed with layer of intermetallic alloy contacting with the above substrate, and layer of metallic alloy located on intermetallic layer. At least on one peripheral sheet side containing pre-coating there is zone not containing metallic alloy layer. In order to obtain welded sheet bar, butt welding at least of two sheets is performed; at that, welded joint is made along the edge adjacent to the zone free from metallic alloy layer. Sheet bar is subject to heat treatment and deformation so that the part is obtained.

EFFECT: high mechanical properties and corrosion resistance.

34 cl, 6 dwg, 2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to laser surfacing process of corrosion protection coating and can be used in mechanical engineering at treatment of working surfaces of parts made of aluminium bronzes including details of ship reinforcement. Method includes delivery of metallic powder and simultaneous treatment of surface by laser ray with power radiant density 104-106 watt/cm2 during 0.0005-2.0 s. Preliminary on part surface it is created intermediate layer of depth not less two diametres of laser ray by means of surface treatment by laser ray with power radiant density 104-106 watt/cm2 and traverse speed 0.2-10.0 mm/s. During the process of overlaying welding depth of metal penetration is kept in the range not more 0.8 of intermediate layer depth.

EFFECT: providing of cracks absence in built-up material and fusion area at laser building-up on aluminium bronze of copper-nickel alloys with content of nickel more than 10%.

1 ex, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to production of pipes by laser welding. Laser welding comprises emitting of two laser beams along edges at open pipe upper surface. Said laser beams are transmitted via different optical fibre glass and have focused spots of diameters making over 0.3 mm. Said laser beams are emitted so that front laser beam and rear laser beam are inclined to welding direction. Note here that incidence angles are defined relative to direction perpendicular to open pipe top surface. Front laser beam falls on open pipe top surface in welding direction before rear laser beam while the letter falls on open pipe top surface in welding direction after front laser beam. Front laser beam incidence angle is set larger than that of rear laser beam. Gap between front laser beam centre and that of rear laser beam is set at open pipe rear surface equal to 1 mm and more.

EFFECT: higher quality of weld, higher yield.

17 cl, 4 dwg, 3 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: laser beam effects point is tracked from inside by laser transducer. Said laser transducer is used to scan the butt across the weld and at the front of welding zone. Said laser transducer is fitted at the rod inside the pipe. Laser transducer position relative to welding head in horizontal is defined by gyro at said rod or by means of extra laser radiator secured with transducer at said rod, extra radiator beam being directed to fixed TV camera.

EFFECT: higher quality of welding.

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, particularly to the method of making bands of steel sheets whereat, at least, two strips of different-grade and/or different-depth steel sheet are welded together by their lengthwise sides. At least, two strips of different-grade and/or different-depth steel sheet are welded together by their lengthwise sides in one pass. Initial strips have no coating. Then, coat is applied on strips welded together. Note here that band is subjected to short-term heating over its entire width to normalise its structure.

EFFECT: higher strength.

12 cl, 3 dwg

FIELD: technological processes.

SUBSTANCE: invention relates to a method and a device of joint attachment of rolled sheet strips (B) by laser welding. The device (0) comprises the main stand (1), a laser welding unit, a unit (3) of jaw details installed on the specified stand (1) to retain strips (B) of rolled sheet, a unit (C) of cutting designed for cutting head ends and tail ends of rolled sheet strips (B). The laser welding unit comprises a laser beam generator for welding of butt-joined strips (B) of rolled sheet and a welding head. The cutting unit (C) comprises upper knives, installed on the upper holder of the knives, and the lower knives arranged with the possibility of displacement relative to the upper knives and with the possibility of rolled sheet strip (B) cutting. The cutting unit (C) comprises a structure (6) for connection of the specified knives fixed on the specified stand (1). The welding head is installed with the possibility of displacement between the upper holder of knives and lower knives. The tail end of the butt-joined strip is clamped with the help of the first jaw detail, and the head end of the strip is pressed with the help of the second jaw detail. Heat and tail ends of strips are cut with the help of the cutting unit. Cut strips are approached and positioned, and they are connected by laser welding. Cutting, approaching, positioning and welding operations are done without jaws opening.

EFFECT: as a result of increased accuracy of strips attachment, evenness of the welding seam is provided.

14 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of steel sheet articles from different-depth steel sheet or strips. Billets are welded together along the butt to get the weld (7) composed by edges of steel sheet or strip workpiece. To rule out loss of quenched structure produced by heating to austenitising temperature, at least one edge of sheet or strip (8, 9) is coated before welding with thick fluid or solid powder or aerosol-like matter including at least one component increasing the strength of the weld (10).

EFFECT: higher weld strength.

28 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine for production of polar plates by laser cutting. This machine comprises bed, laser cutting assembly, cutting manipulator to drive laser cutting assembly, control system and at least one strip feeder. Strip feeder comprises manipulator for gripping, means for strip feeding to preset length and strip release means. Cutting and gripping manipulators are arranged at the bed. Means for strip feeding to preset length is arranged between gripping manipulator and strip release means. Control system is connected with cutting manipulator, gripping manipulator and means for strip feeding to preset length.

EFFECT: production of plates for lithium-ion storage batteries and super capacitors by laser technology, higher quality of plates.

10 cl, 5 dwg

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